1843.] Law of Storms in India. 365 



Intelligence from Porto Novo. 



" 24th October. — Brig George came ashore, fresh gales from the 

 N. W. ; 6 p. m. shifted to S. W. ; midnight wind due South, much 

 moderated ; 3 a. m. 25th, fresh Southerly and S. W. breeze, with occa- 

 sional heavy gusts." 



Having addressed Captain Campbell, Assistant Surveyor General, 

 Southern India, to request that he would assist me in procuring such 

 information as he could obtain to assist in tracing the storm inland, 

 he has obligingly sent me in addition to his official report, those 

 mentioned in the following extracts from his private letter : — 



Ryacottah, 8th March, 1843. 



" Ryacottah is in latitude 12° 31' 20" N. longitude 78° 4' 44" E. and 

 by elevation is about 3145 feet above the sea, as deduced from the 

 data of Col. Lambton's Survey. 



I send you a set of observations with the Barometer made at Bangalore 

 by Mr. Garrett, with the same instrument as before, he only remarks 

 on the 25th, " Rain and tremendous wind at night." These observa- 

 tions with both instruments are merely corrected for the peculiarities 

 of the instruments. 



The former observations were reduced to 32°, for an expansion of 

 0.018018 feet for each inch of mercury, and for 180° of temperature 

 according to Dulong and Petit. 



I enclose also some observations made by Lieut. Robertson, Su- 

 perintendent of Roads near Patcheeroopum in the Amboor valley, which 

 place you will find in the 78th sheet of the Indian Atlas, to be 

 about 34 miles S. by W. of Vellore. 



I conceive the reason of the strength of the storm not being felt 

 there arises from some high precipitous hills which shelter the plain of 

 observation.* The instrument is a very fine one, but I do not know 

 if it has been compared. 



10^ March — I have this morning received from Capt. J. Green, the 

 Superintending Engineer at Bangalore, a splendid draft of the storm, 

 taken with Newmann's self-registring machine. You will see that 



* I have no doubt this was the true reason, and that it might, as in the case of Gyah 

 and Pooah, in my Seventh Memoir, Vol, XI, Jan. 8, have been seen overhead. — H. P. 



